Developmental and environmental effects on VTC2-dependent leaf ascorbate accumulation and functions.

ABSTRACT: In nature, environmental conditions strongly fluctuate, frequently subjecting plants to periods of immediate photo-oxidative stress. The small molecule ascorbate allows plants to cope with such stress conditions. Ascorbate scavenges reactive oxygen species and enables the rapid and full induction of photoprotective non-photochemical quenching (NPQ). NPQ is dependent on zeaxanthin, which requires ascorbate as the electron donor during its synthesis by the violaxanthin de-epoxidase. The VTC2 gene encodes one of two isoforms of GDP-l-galactose phosphorylase, the rate-controlling enzyme of ascorbate biosynthesis. In the current study, by including a newly identified vtc2 allele, we found that loss of VTC2 depleted ascorbate mainly from the mature leaves and thereby limited NPQ specifically in

SUBMITTER: Kappel S 

PROVIDER: S-EPMC12404783 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature